[PATCH v2 0/5] More Rust bindings for device property reads

[Remo Senekowitsch]

This adds more Rust bindings for reading device properties, based on
Rob Herring's work. I'm working on a driver[1] that uses these, but the
driver has more dependencies than this.

Rob Herring and Dirk Behme did several review iterations over on Zulip
already[1], I'm thankful for their great input.

This is my second-ever patch series. I read through the documentation
for sending patches[2] carefully, trying to apply everything to the best
of my understanding. Please point out any specifics if I got something
wrong.

Best regards,
Remo

changes in v2:
- Add property.rs to maintainers file
- Add and improve lots of safety comments
- Use `__dev_fwnode` istead of `dev_fwnode` to express the intent better
- Make `get_child_by_name` not return a `PropertyGuard`
- Squash the patch with the generic read method
- Squash the PropertyGuard patch
- Remove `arrayvec`, abstract over `fwnode_reference_args` instead
- Log the full fwnode path in case of a missing property
- Remove integer trait and export of fwnode_property_read_int_array
  These are not needed now that a macro is used to associate each
  integer type with its corresponding `read_*_array` function.
- Replace `impl Property for bool` with a standalone function
  `property_read_bool` with an infallible function signature
- Extract parsing of properties into separate function in sample
  platform driver

Link: https://rust-for-linux.zulipchat.com/#narrow/channel/288089-General/topic/DS90UB954.20driver.20done.2C.20ready.20to.20upstream.3F/with/507874342 [1]
Link: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#the-canonical-patch-format [2]

Remo Senekowitsch (5):
  rust: Move property_present to separate file
  rust: Add bindings for reading device properties
  rust: property: Add child accessor and iterator
  rust: property: Add property_get_reference_args
  samples: rust: platform: Add property read examples

 MAINTAINERS                                  |   1 +
 drivers/of/unittest-data/tests-platform.dtsi |   3 +
 rust/helpers/helpers.c                       |   1 +
 rust/helpers/property.c                      |   8 +
 rust/kernel/device.rs                        |   7 -
 rust/kernel/lib.rs                           |   1 +
 rust/kernel/property.rs                      | 608 +++++++++++++++++++
 samples/rust/rust_driver_platform.rs         |  69 ++-
 8 files changed, 688 insertions(+), 10 deletions(-)
 create mode 100644 rust/helpers/property.c
 create mode 100644 rust/kernel/property.rs

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2.49.0